Precipitation variability in East Timor during the Last 16,500 years
| Autor: | Jin-Ping Chen, 陳晉平 |
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| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 Here we present replicated stalagmite analysis δ18O records over the past 16.5 thousand years (ka, before 1950 AD) with a gap of 11.5-5.7 ka of three stalagmites from Lekiraka cave in East Timor (8o47’10.8”S, 126o23’31.1”E; 626 m above sea level). Lekiraka δ18O record suggests a relatively dry condition during the glacial period, comparing with the late Holocene. Depletion in 18O during Younger Dryas (YD) stadial suggests a wet condition with high precipitation, which is consistent with that of Liang Luar cave record in Flores, but in contrary to a dry condition in the Asian monsoon (AM) territory. Insignificant δ18O change during 16-12 ka indicates that a wet Bolling-Allerod (BA) interstadial in AM territory is not clear at this low-latitude zone. We propose that the intensified precipitation in YD and “muted” BA could be attributed to: (1) enhanced Australian-Indonesian summer monsoon (AISM), (2) displacement of Intertropical Convergence Zone (ITCZ), and/or (3) exposed Sunda shelf landmass lead to change of the regional atmospheric circulation. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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